Revert "Merge branch 'add_duplicate_notes_note_trigram_index' into 'master'"

This reverts merge request !61430

changelogs/unreleased/add_duplicate_notes_note_trigram_index.yml

----
-title: Add duplicated gin trigram index on notes table (note) to replace existing
-merge_request: 61430
-author:
-type: performance

db/post_migrate/20210511051718_create_index_on_notes_note.rb

-# frozen_string_literal: true
-
-# See https://docs.gitlab.com/ee/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
-class CreateIndexOnNotesNote < ActiveRecord::Migration[6.0]
-  include Gitlab::Database::MigrationHelpers
-
-  DUPLICATE_INDEX_NAME = 'index_notes_on_note_gin_trigram'
-  CURRENT_INDEX_NAME = 'index_notes_on_note_trigram'
-
-  disable_ddl_transaction!
-
-  # https://gitlab.com/gitlab-org/gitlab/-/issues/218410#note_565624409
-  # We are having troubles with the index, and some inserts are taking a long time
-  # so in this migration we are recreating the index
-  def up
-    add_concurrent_index :notes, :note, name: DUPLICATE_INDEX_NAME, using: :gin, opclass: :gin_trgm_ops
-    remove_concurrent_index_by_name :notes, CURRENT_INDEX_NAME
-  end
-
-  def down
-    add_concurrent_index :notes, :note, name: CURRENT_INDEX_NAME, using: :gin, opclass: :gin_trgm_ops
-    remove_concurrent_index_by_name :notes, DUPLICATE_INDEX_NAME
-  end
-end

db/schema_migrations/20210511051718

-2d11da499f49964f37cc0a2c541cf58182416ae7b6b0e762a135b327099de1a4
\ No newline at end of file

db/structure.sql

@@ -23674,7 +23674,7 @@ CREATE INDEX index_notes_on_discussion_id ON notes USING btree (discussion_id);
 
 CREATE INDEX index_notes_on_line_code ON notes USING btree (line_code);
 
-CREATE INDEX index_notes_on_note_gin_trigram ON notes USING gin (note gin_trgm_ops);
+CREATE INDEX index_notes_on_note_trigram ON notes USING gin (note gin_trgm_ops);
 
 CREATE INDEX index_notes_on_noteable_id_and_noteable_type_and_system ON notes USING btree (noteable_id, noteable_type, system);